Thanks for looking at this @William - sorry to nitpick but I wonder if
rewriting the test as follows could make it a bit easier to parse (at
least for me I find this version easier to grok what is being tested
for):

if (*name < '1' || *name > '9')

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https://bugs.launchpad.net/bugs/1927078

Title:
  Don't allow useradd to use fully numeric names

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